feat(config): add streaming support and config cloning

Add streaming capability to crawler configurations and introduce clone() methods
for both BrowserConfig and CrawlerRunConfig to support immutable config updates.
Move stream parameter from arun_many() method to CrawlerRunConfig.

BREAKING CHANGE: Removed stream parameter from AsyncWebCrawler.arun_many() method.
Use config.stream=True instead.

crawl4ai/async_configs.py

@@ -186,6 +186,50 @@ class BrowserConfig:
             extra_args=kwargs.get("extra_args", []),
         )
 
+    def to_dict(self):
+        return {
+            "browser_type": self.browser_type,
+            "headless": self.headless,
+            "use_managed_browser": self.use_managed_browser,
+            "use_persistent_context": self.use_persistent_context,
+            "user_data_dir": self.user_data_dir,
+            "chrome_channel": self.chrome_channel,
+            "channel": self.channel,
+            "proxy": self.proxy,
+            "proxy_config": self.proxy_config,
+            "viewport_width": self.viewport_width,
+            "viewport_height": self.viewport_height,
+            "accept_downloads": self.accept_downloads,
+            "downloads_path": self.downloads_path,
+            "storage_state": self.storage_state,
+            "ignore_https_errors": self.ignore_https_errors,
+            "java_script_enabled": self.java_script_enabled,
+            "cookies": self.cookies,
+            "headers": self.headers,
+            "user_agent": self.user_agent,
+            "user_agent_mode": self.user_agent_mode,
+            "user_agent_generator_config": self.user_agent_generator_config,
+            "text_mode": self.text_mode,
+            "light_mode": self.light_mode,
+            "extra_args": self.extra_args,
+            "sleep_on_close": self.sleep_on_close,
+            "verbose": self.verbose,
+            "debugging_port": self.debugging_port,
+        }
+
+    def clone(self, **kwargs):
+        """Create a copy of this configuration with updated values.
+        
+        Args:
+            **kwargs: Key-value pairs of configuration options to update
+            
+        Returns:
+            BrowserConfig: A new instance with the specified updates
+        """
+        config_dict = self.to_dict()
+        config_dict.update(kwargs)
+        return BrowserConfig.from_kwargs(config_dict)
+
 
 class CrawlerRunConfig:
     """
@@ -319,7 +363,12 @@ class CrawlerRunConfig:
         log_console (bool): If True, log console messages from the page.
                             Default: False.
 
+        # Streaming Parameters
+        stream (bool): If True, enables streaming of crawled URLs as they are processed when used with arun_many.
+                      Default: False.
+
         # Optional Parameters
+        stream (bool): If True, stream the page content as it is being loaded.
         url: str = None  # This is not a compulsory parameter
     """
 
@@ -387,6 +436,8 @@ class CrawlerRunConfig:
         # Debugging and Logging Parameters
         verbose: bool = True,
         log_console: bool = False,
+        # Streaming Parameters
+        stream: bool = False,
         url: str = None,
     ):
         self.url = url
@@ -463,6 +514,9 @@ class CrawlerRunConfig:
         self.verbose = verbose
         self.log_console = log_console
 
+        # Streaming Parameters
+        self.stream = stream
+
         # Validate type of extraction strategy and chunking strategy if they are provided
         if self.extraction_strategy is not None and not isinstance(
             self.extraction_strategy, ExtractionStrategy
@@ -555,6 +609,8 @@ class CrawlerRunConfig:
             # Debugging and Logging Parameters
             verbose=kwargs.get("verbose", True),
             log_console=kwargs.get("log_console", False),
+            # Streaming Parameters
+            stream=kwargs.get("stream", False),
             url=kwargs.get("url"),
         )
 
@@ -583,7 +639,6 @@ class CrawlerRunConfig:
             "no_cache_read": self.no_cache_read,
             "no_cache_write": self.no_cache_write,
             "shared_data": self.shared_data,
-            # Page Navigation and Timing Parameters 
             "wait_until": self.wait_until,
             "page_timeout": self.page_timeout,
             "wait_for": self.wait_for,
@@ -616,5 +671,32 @@ class CrawlerRunConfig:
             "exclude_domains": self.exclude_domains,
             "verbose": self.verbose,
             "log_console": self.log_console,
+            "stream": self.stream,
             "url": self.url,
         }
+
+    def clone(self, **kwargs):
+        """Create a copy of this configuration with updated values.
+        
+        Args:
+            **kwargs: Key-value pairs of configuration options to update
+            
+        Returns:
+            CrawlerRunConfig: A new instance with the specified updates
+            
+        Example:
+            ```python
+            # Create a new config with streaming enabled
+            stream_config = config.clone(stream=True)
+            
+            # Create a new config with multiple updates
+            new_config = config.clone(
+                stream=True,
+                cache_mode=CacheMode.BYPASS,
+                verbose=True
+            )
+            ```
+        """
+        config_dict = self.to_dict()
+        config_dict.update(kwargs)
+        return CrawlerRunConfig.from_kwargs(config_dict)

crawl4ai/async_webcrawler.py

@@ -701,7 +701,6 @@ class AsyncWebCrawler:
         urls: List[str],
         config: Optional[CrawlerRunConfig] = None, 
         dispatcher: Optional[BaseDispatcher] = None,
-        stream: bool = False,
         # Legacy parameters maintained for backwards compatibility
         word_count_threshold=MIN_WORD_THRESHOLD,
         extraction_strategy: ExtractionStrategy = None,
@@ -723,7 +722,6 @@ class AsyncWebCrawler:
         urls: List of URLs to crawl
         config: Configuration object controlling crawl behavior for all URLs
         dispatcher: The dispatcher strategy instance to use. Defaults to MemoryAdaptiveDispatcher
-        stream: If True, returns an AsyncGenerator yielding results as they complete
         [other parameters maintained for backwards compatibility]
 
         Returns:
@@ -743,8 +741,7 @@ class AsyncWebCrawler:
         # Streaming results
         async for result in await crawler.arun_many(
             urls=["https://example1.com", "https://example2.com"],
-            config=CrawlerRunConfig(cache_mode=CacheMode.BYPASS),
-            stream=True
+            config=CrawlerRunConfig(cache_mode=CacheMode.BYPASS, stream=True),
         ):
             print(f"Processed {result.url}: {len(result.markdown)} chars")
         """
@@ -783,6 +780,8 @@ class AsyncWebCrawler:
             ) or task_result.result
         )
 
+        stream = config.stream
+        
         if stream:
             async def result_transformer():
                 async for task_result in dispatcher.run_urls_stream(crawler=self, urls=urls, config=config):

tests/20241401/test_stream.py

@@ -33,9 +33,7 @@ async def test_crawler():
         print("\n=== Testing Streaming Mode ===")
         async for result in await crawler.arun_many(
             urls=urls,
-            config=crawler_config,
-            stream=True,
-            verbose=True
+            config=crawler_config.clone(stream=True),
         ):
             print(f"Received result for: {result.url} - Success: {result.success}")
             
@@ -43,8 +41,6 @@ async def test_crawler():
         results = await crawler.arun_many(
             urls=urls,
             config=crawler_config,
-            stream=False,
-            verbose=True
         )
         print(f"Received all {len(results)} results at once")
         for result in results: